Plz ! can someone with 2 a and 2 b ?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10